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  使用Xcode的Instruments(Leaks)监测App的内存泄漏问题
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  <p>最近项目提交App Store审核，有些闲暇时间，打算用Instruments工具里的Leaks<br>检查一下项目中存在的内存泄漏问题。</p>
<h4 id="一、准备工作"><a href="#一、准备工作" class="headerlink" title="一、准备工作"></a>一、准备工作</h4><h5 id="1-edit-scheme"><a href="#1-edit-scheme" class="headerlink" title="1.edit scheme"></a>1.edit scheme</h5><p>修改为测试环境<br><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/0.edit-scheme.png"><br>将Profile中的Build Configuration选为Debug<br><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/0.profile-debug.png"></p>
<h5 id="2-Debug-Information-Format"><a href="#2-Debug-Information-Format" class="headerlink" title="2.Debug Information Format"></a>2.Debug Information Format</h5><p>设置调试运行的时候生成 dSYM文件（用于代码定位）</p>
<p><code>Build Settings --&gt; Debug Information Format</code></p>
<p><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/0.debug-information-format.jpg"></p>
<h4 id="二、开始监测"><a href="#二、开始监测" class="headerlink" title="二、开始监测"></a>二、开始监测</h4><h5 id="1-打开Instruments"><a href="#1-打开Instruments" class="headerlink" title="1.打开Instruments"></a>1.打开Instruments</h5><p>在Xcode的导航栏中找到Instruments。</p>
<p><code>Xcode --&gt; Open Developer Tool --&gt; Instruments</code></p>
<p><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/1%E6%89%BE%E5%88%B0instruments.png"></p>
<h5 id="2-双击选择Leaks"><a href="#2-双击选择Leaks" class="headerlink" title="2.双击选择Leaks"></a>2.双击选择Leaks</h5><p><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/2%E9%80%89%E6%8B%A9leaks.png"></p>
<h5 id="3-选择设备和项目"><a href="#3-选择设备和项目" class="headerlink" title="3.选择设备和项目"></a>3.选择设备和项目</h5><p>找到运行的设备和正在运行的项目。</p>
<p>选好设备和项目，点击左侧的大红点，项目会在对应的设备中重新运行一次。并做好监测准备<br><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/3%E9%80%89%E6%8B%A9%E8%AE%BE%E5%A4%87%E4%BB%A5%E5%8F%8A%E9%A1%B9%E7%9B%AE.png"></p>
<h5 id="4-内存监测"><a href="#4-内存监测" class="headerlink" title="4.内存监测"></a>4.内存监测</h5><p>由于Leaks是动态监测，所以需要一边手动操作App，一边观察Leaks界面上的变化。当出现红色叉叉时，说明出现了内存泄漏，可以暂停进程，进行查看<br><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/4.%E5%8F%91%E7%8E%B0%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F%EF%BC%8C%E5%B9%B6%E6%9A%82%E5%81%9C%E8%BF%9B%E7%A8%8B.png"></p>
<p>5.定位内存泄漏的位置<br>选择 <code>Leaks ——&gt; Call Tree</code>，最底下会出现4个选框<br><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/6%E9%80%89%E6%8B%A9calltree.png"></p>
<p>5.1 点击第二个<code>Call Tree</code>，勾选 <code>Invert Call Tree</code> 和 <code>Hide System Libraries</code></p>
<p><strong>勾选前</strong><br>![](<a target="_blank" rel="noopener" href="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/7.call">https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/监测App的内存泄漏/7.call</a> tree不选之前的对比图.png)</p>
<p><strong>勾选后</strong><br>![](<a target="_blank" rel="noopener" href="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/7.call">https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/监测App的内存泄漏/7.call</a> tree 选项.png)</p>
<h5 id="6-确认位置，修改代码"><a href="#6-确认位置，修改代码" class="headerlink" title="6.确认位置，修改代码"></a>6.确认位置，修改代码</h5><p>此时显示的就是若干条内存泄漏的代码部分，选择其中一条双击，即可显示代码。还可直接跳转到代码在Xcode中额具体位置<br><img src="https://gitee.com/hongdongjie/gg266picgo/raw/master/pic4blog/%E7%9B%91%E6%B5%8BApp%E7%9A%84%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/8%E8%B7%B3%E8%BD%AC.png"></p>
 
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            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.min.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script> 
<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->
 
<script src="/js/busuanzi-2.3.pure.min.js"></script>
 
<!-- ClickLove -->

<!-- ClickBoom1 -->

<!-- ClickBoom2 -->

<!-- CodeCopy -->
 
<link rel="stylesheet" href="/css/clipboard.css">
 <script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>
 
<!-- CanvasBackground -->

<script>
  if (window.mermaid) {
    mermaid.initialize({ theme: "forest" });
  }
</script>


    
    <div id="music">
    
    
    
    <iframe frameborder="no" border="1" marginwidth="0" marginheight="0" width="200" height="52"
        src="//music.163.com/outchain/player?type=2&id=1908797593&auto=1&height=32"></iframe>
</div>

<style>
    #music {
        position: fixed;
        right: 15px;
        bottom: 0;
        z-index: 998;
    }
</style>
    
    

  </div>
</body>

</html>